DISCOVERY OF AN L4 beta CANDIDATE MEMBER OF ARGUS IN THE PLANETARY MASS REGIME: WISE J231921.92+764544.4

作者：Castro Philip J^*; Gizis John E

来源：Astrophysical Journal, 2016, 816(2): 78.

DOI：10.3847/0004-637X/816/2/78

• brown dwarfs
• infrared: stars
• proper motions
• stars: distances
• stars: individual (WISE J231921.92+764544.4)
• stars: late-type

We present the discovery of a young L dwarf, WISE J231921.92+764544.4, identified by comparing the Wide-field Infrared Survey Explorer (WISE) All-Sky Catalog to the Two Micron All Sky Survey (2MASS). A medium-resolution optical spectrum provides a spectral type of L4 beta, with a photometric distance estimate of 26.1 +/- 4.4 pc. The red WISE W1 - W2 color provides additional evidence of youth, while the 2MASS J - K-s color does not. WISE J231921.92+ 764544.4 is a candidate member of the young moving group Argus, with the space motion and position of WISE J231921.92+764544.4 giving a probability of 79% for membership in Argus and a probability of 21% as a field object, based on BANYAN II. WISE J231921.92+764544.4 has a mass of 12.1 +/- 0.4 M-Jup based on membership in Argus, within the planetary mass regime.

• 出版日期2016-1-10